package j76;

import java.util.HashMap;
import java.util.WeakHashMap;

/**
 * @author chengshuai
 * @date 2021/4/18 15:30
 */
public class WeakHashMapDemo {

    public static void main(String[] args) {
//        myHashMap();
        myWeakHashMap();
    }

    private static void myWeakHashMap() {
        WeakHashMap<Object, Object> map = new WeakHashMap<>();
        Integer key = new Integer(2);
        String value = "WeakHashMap";

        map.put(key, value);
        System.out.println(map);

        key = null;
        System.out.println(map);

        System.gc();
        System.out.println(map + "\t" + map.size());
    }


    private static void myHashMap() {
        HashMap<Integer, String> map = new HashMap<>();
        Integer key = new Integer(1);
        String value = "HashMap";

        map.put(key, value);
        System.out.println(map);
        key = null;
        System.out.println(map);
    }
}
